Secondary Chromosome Associations in &lt;i&gt;Ocimum&lt;/i&gt; spp.

Mukherjee, Moumita; Datta, and Animesh K.

doi:10.1508/cytologia.71.149

Cited by 20 publications

(12 citation statements)

References 9 publications

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“…In O. tenuiflorum (Green form), 2n=36 chromosomes were also reported earlier (Mukherjee and Datta 2006). Thus the present report correlates to the earlier findings.…”

Section: Resultssupporting

confidence: 92%

Conventional and Fluorescent Karyotype Analysis of Ocimum spp.

Dash¹,

Afroz²,

Sultana³

et al. 2017

CYTOLOGIA

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Four specimens of Ocimum viz. O. basilicum L., O. gratissimum L. and two forms of O. tenuiflorum L. (Green form and Purple form) were cytogenetically studied for authentic characterization. The green and purple forms of O. tenuiflorum L. are found to possess 2n=36 and 2n=34 chromosomes, respectively. On the other hand, 2n=54 chromosomes were observed in O. basilicum L. and 2n=40 chromosomes in O. gratissimum L. In this study, 2n chromosome number of O. tenuiflorum L. (Purple form) and O. basilicum L. are the first report. Six sub-metacentric chromosomes were observed in the green form of O. tenuiflorum L. (30m+6sm) while other three specimens possessed only metacentric chromosomes. These four specimens of Ocimum L. have distinct CMA-and DAPI-banding patterns based on the number, location, intensity and percentage of GC-and AT-rich repeats. Two CMA fluoresced satellites were observed in only O. gratissimum L. indicating stain specific nature of the satellite portions. Moreover, it was possible to identify certain marker chromosomes specific for each specimen with the help of CMA and DAPI banding pattern. The two forms (Green and Purple) of O. tenuiflorum L. are sharply different in respect of conventional karyotype and fluorescent banding pattern. Thus, a subtle revision is essential regarding their taxonomic status.

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“…In O. tenuiflorum (Green form), 2n=36 chromosomes were also reported earlier (Mukherjee and Datta 2006). Thus the present report correlates to the earlier findings.…”

Section: Resultssupporting

confidence: 92%

Conventional and Fluorescent Karyotype Analysis of Ocimum spp.

Dash¹,

Afroz²,

Sultana³

et al. 2017

CYTOLOGIA

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“…For instance, chromosome numbers of 2n = 32, 2n = 36 and 2n = 76 have been reported for O. tenuiflorum L. with basic number of eight (mukherjee et al, 2005 and 72), O. basilicum L. (2n = 48) and O. kilimandscharicum Guerke (2n = 76), etc. (soBti & PushPangadan, 1977;mukherjee & datta, 2006). Infrageneric classification made by Paton et al (1999) is the presently accepted infrageneric structuring of the genus, based on parsimony analysis of the morphological variations of the genus and close relatives.…”

Section: Introductionmentioning

confidence: 99%

Mitotic and meiotic studies on two species of Ocimum (Lamiaceae) and their F₁hybrids

Idowu

Oziegbe

2017

Botanica Lithuanica

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Ocimum L. species are important aromatic and medicinal plants. Many researchers have observed complexity in their chromosome numbers and ploidy levels. We studied the somatic and germline chromosomal features and behaviour of Ocimum basilicum L., two variants of O. canum Sims (‘c1’ and ‘c2’) and their F1hybrids. Chromosomes from root tips and flower buds were investigated using standard techniques; karyograms were formed and analysed. A chromosome number of 2n = 4x = 52 was observed in O. basilicum and O. canum ‘c1’ and their F1hybrid. One of the variants, O. canum ‘c2’ had a chromosome number of 2n = 2x = 24 and its intraspecific hybrid O. canum ‘c2’ × O. canum ‘c1’ had a chromosome number of 2n = 38. These Ocimum species and their F1hybrids showed different karyotype formula, but their chromosomes were mostly metacentric (174) and submetacentric (36) with few subtelocentric (8). Based on pairing configuration, O. basilicum is an allotetraploid plant, O. canum ‘c1’ is an autotetraploid plant and the O. canum ‘c1’ is a diploid. The F1 hybrids showed higher frequency of meiotic abnormalities than the parents. The study showed intraspecific and interspecific variation in chromosome numbers and pairing patterns, but the chromosomes of the Ocimum species were similar in their centromeric positions.

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“…Only a few to many groups of cells exhibited cytomixis in P 1 , P 4 and P 7 thereby indicating that meiocytes either vary in their cytomictic potential or fail to get exposed to the specific condition(s) required to trigger the process. Datta et al (2005) were of the opinion that those cell clusters formed during early microsporogenesis and persisted during the process of meiosis may have signalled the phenomenon of cytomixis.…”

Section: Discussionmentioning

confidence: 99%

Inter- and Intra-Plant Variations in Cytomictic Behavior of Chromosomes in Corchorus fascicularis Lamk. (Tiliaceae)

Mandal

Datta

2012

CYTOLOGIA

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Summary Cytomictic behavior (assessed from meiotic studies performed during July to August period A and August to September period B; out of 7 plants designated as P 1 to P 7 , cytomixis is recorded in P 1 and P 7 in both the periods, while P 4 only in period B) was noted in a wild species of Corchorus (C. fascicularis Lamk.; Family: Tiliaceae, important genetic resource for Jute) under acclimatization /cultivation (3rd generation raised from bulk seeds of previous generation plants) in the experimental field plots of University of Kalyani, West Bengal, India (latitude 22 50′ to 24 11′ N, longitude 88 09′ to 88 48′ E, altitude 9.75 m, sandy loamy soil, pH 6.89). The intensity of cytomixis varied among the plants (P 1 showed high degree of cytomictic behavior; while it was incipient in P 4 and P 7 ) and between the periods. Cytomixis was evidenced at early prophase including diplotenediakinesis and metaphase I and rare, often in anaphase I cells resulting in aneuploid (hypo-: n=1-6, hyperploid: n=8 to 14 and 18) variations in chromosome number at meiosis I. These results may suggest that the phenomenon of cytomixis is a natural cellular process controlled genetically and to an extent influenced by environmental factor(s) and the gene(s) involved in the process, and that it may be differentially expressed or repressed under a given set of condition(s).

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Secondary Chromosome Associations in <i>Ocimum</i> spp.

Cited by 20 publications

References 9 publications

Conventional and Fluorescent Karyotype Analysis of <i>Ocimum</i> spp.

Conventional and Fluorescent Karyotype Analysis of <i>Ocimum</i> spp.

Mitotic and meiotic studies on two species of Ocimum (Lamiaceae) and their F₁hybrids

Inter- and Intra-Plant Variations in Cytomictic Behavior of Chromosomes in <i>Corchorus fascicularis</i> Lamk. (Tiliaceae)

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Secondary Chromosome Associations in <i>Ocimum</i> spp.

Cited by 20 publications

References 9 publications

Conventional and Fluorescent Karyotype Analysis of <i>Ocimum</i> spp.

Conventional and Fluorescent Karyotype Analysis of <i>Ocimum</i> spp.

Mitotic and meiotic studies on two species of Ocimum (Lamiaceae) and their F1hybrids

Inter- and Intra-Plant Variations in Cytomictic Behavior of Chromosomes in <i>Corchorus fascicularis</i> Lamk. (Tiliaceae)

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Mitotic and meiotic studies on two species of Ocimum (Lamiaceae) and their F₁hybrids